captured three very loud knocks on our video camera at a sight-seeing over hang in the Kiamiche Mountains. We had stopped on the way home from the Memorial Weekend Oklahoma Meeting in 2007 (I think). The knocking sounds were too loud and too short to have been made by a Woodpecker, although they could have been done by a human. But since we were a good distance from fellow campers still in their undisclosed location when we filmed it, we thought it unusual and that we'd possibly heard a monster tree knocking. The sound unsettled us, although we saw nothing in the area that could have been hitting a tree. Silver joked before we left the place, "I think 'they' want us to leave." So, we left.